% This chapter is common to the DOLFIN and FFC manuals.\subsection{Downloading the source code}\index{downloading}\index{source code}The latest release of \package{} can be obtained as a \texttt{tar.gz}archive in the download section at\begin{code} http://www.fenics.org/\end{code}Download the latest release of \package{}, for example \texttt{\packagett{}-x.y.z.tar.gz},and unpack using the command\begin{macrocode}# tar zxfv \packagett{}-x.y.z.tar.gz\end{macrocode}This creates a directory \texttt{\packagett{}-x.y.z} containing the\package{} source code.If you want the very latest version of \package{}, it can be accesseddirectly from the development repository through \texttt{hg}(Mercurial):\begin{macrocode}# hg clone http://www.fenics.org/hg/\packagett{}\end{macrocode}This version may contain features not yet present in the latestrelease, but may also be less stable and even not work at all.